num
of characters with the specified mask character.String.prototype.slice()
to grab the portion of the characters that will remain unmasked.String.padStart()
to fill the beginning of the string with the mask
character up to the original length.num
is negative, the unmasked characters will be at the start of the string.num
, to keep a default of 4
characters unmasked.mask
, to use a default character of '*'
for the mask.const mask = (cc, num = 4, mask = '*') => `${cc}`.slice(-num).padStart(`${cc}`.length, mask);
mask(1234567890); // '******7890'
mask(1234567890, 3); // '*******890'
mask(1234567890, -4, '$'); // '$$$$567890'
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